fkie_cve-2024-42161
Vulnerability from fkie_nvd
Published
2024-07-30 08:15
Modified
2025-11-03 22:17
Severity ?
6.3 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD [Changes from V1: - Use a default branch in the switch statement to initialize `val'.] GCC warns that `val' may be used uninitialized in the BPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as: [...] unsigned long long val; \ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6dbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974affPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff941a8449e712eaf7efca1a13bfb9afd3d99fc2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6dbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974affPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff941a8449e712eaf7efca1a13bfb9afd3d99fc2Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0ADFA1F9-906A-4D75-8667-7FECEF422B59",
              "versionEndExcluding": "5.10.222",
              "vulnerable": true
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              "versionEndExcluding": "6.6.39",
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            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "6.9.9",
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            }
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          "negate": false,
          "operator": "OR"
        }
      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD\n\n[Changes from V1:\n - Use a default branch in the switch statement to initialize `val\u0027.]\n\nGCC warns that `val\u0027 may be used uninitialized in the\nBPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as:\n\n\t[...]\n\tunsigned long long val;\t\t\t\t\t\t      \\\n\t[...]\t\t\t\t\t\t\t\t      \\\n\tswitch (__CORE_RELO(s, field, BYTE_SIZE)) {\t\t\t      \\\n\tcase 1: val = *(const unsigned char *)p; break;\t\t\t      \\\n\tcase 2: val = *(const unsigned short *)p; break;\t\t      \\\n\tcase 4: val = *(const unsigned int *)p; break;\t\t\t      \\\n\tcase 8: val = *(const unsigned long long *)p; break;\t\t      \\\n        }       \t\t\t\t\t\t\t      \\\n\t[...]\n\tval;\t\t\t\t\t\t\t\t      \\\n\t}\t\t\t\t\t\t\t\t      \\\n\nThis patch adds a default entry in the switch statement that sets\n`val\u0027 to zero in order to avoid the warning, and random values to be\nused in case __builtin_preserve_field_info returns unexpected values\nfor BPF_FIELD_BYTE_SIZE.\n\nTested in bpf-next master.\nNo regressions."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Evite el valor no inicializado en BPF_CORE_READ_BITFIELD [Cambios desde V1: - Use una rama predeterminada en la instrucci\u00f3n switch para inicializar `val\u0027.] GCC advierte que `val\u0027 puede usarse sin inicializar en la macro BPF_CRE_READ_BITFIELD, definida en bpf_core_read.h como: [...] unsigned long long val; \\ [...] \\ switch (__CORE_RELO(s, campo, BYTE_SIZE)) { \\ case  1: val = *(const unsigned char *)p; break; \\ case 2: val = *(const unsigned short *)p; break; \\ case 4: val = *(const unsigned int *)p; romper; \\ case 8: val = *(const unsigned long long *)p; break; \\ } \\ [...] val; \\ } \\ Este parche agrega una entrada predeterminada en la declaraci\u00f3n de cambio que establece `val\u0027 en cero para evitar la advertencia, y valores aleatorios que se usar\u00e1n en caso de que __builtin_preserve_field_info devuelva valores inesperados para BPF_FIELD_BYTE_SIZE. Probado en bpf-next master. Sin regresiones."
    }
  ],
  "id": "CVE-2024-42161",
  "lastModified": "2025-11-03T22:17:44.150",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 5.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-07-30T08:15:07.447",
  "references": [
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/009367099eb61a4fc2af44d4eb06b6b4de7de6db"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://git.kernel.org/stable/c/3364c2ed1c241989847f19cf83e3db903ce689e3"
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/7e5471b5efebc30dd0bc035cda86693a5c73d45f"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://git.kernel.org/stable/c/a21d76bd0b0d39518e9a4c19f6cf7c042a974aff"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://git.kernel.org/stable/c/b694989bb13ed5f166e633faa1eb0f21c6d261a6"
    },
    {
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    },
    {
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      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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